I seen your comment in the following post http://www.edugeek.net/forums/av-mul...ower-down.html
we are now having the same trouble as mentioned and they were fitted in 2009 as part of an IWB install in here too.
Is there a thermal switch in them like the PLC-XE40. Teacher is lost without it.
I have the following:
Serial Number 68Z22135
Any help would be great